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Boxer knocking the stuffing out of Teddy boy (5)

Ross

I believe the answer is:

tyson

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'boxer' is the definition.
(US boxer Mike Tyson)

I don't understand how the rest of the clue works.

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(Other definitions for tyson that I've seen before include "Mike ..., former US prizefighter" , "Mike --, US boxer" , "26 4 [RING MASTER]" , "Youngest ever undisputed world heavyweight boxing champion, b, 1966" , "Undisputed world heavyweight champion, 1987" .)

I've seen this clue in The Guardian.
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